Nemesis Cheats - GameBoy

More power-ups
Pause game play and press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [B], [A], [Start].

Options mode
Pause game play and press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [A] + [B], Start. Weapons, shields, missiles, and lasers may now be available.

Full speed and shields
Pause game play and press [B]x5, [A]x5, [Start].

Destroy all on-screen enemies
Pause game play and press [Up], [Right], [Down], [Left], [Up], [Right], [Down], [Left], [B], [A].

Expert mode
Pause game play and press [Up], [Select], [Down], [Select], [Left], [Select], [Right], [Select]x3. Collecting power-ups will have no effect on your ship.

Remove current power-up
Pause game play and press [[A], [Left]] five times.

Bonus levels

Level 2
Destroy the volcano towards the top after the ceiling drops and rises. Fly through the hole where the volcano was located.

Level 4
Destroy the second Re-Bone blocking the narrow passage near the end of the level. Fly to the bottom of the passage to reach the wall behind your ship.